Hi David, On 02/14/2013 05:52 AM, David OShea wrote: > Hi, > > My understanding (hopefully someone will correct me if I'm wrong) is that > each time you invoke 'lttng enable-event', your specification for the events > you want enabled is stored and applied, and/or potentially applied later if a > new application connects to the session daemon. All 'lttng disable-event' > does is remove one of the specifications you previously provided to 'lttng > enable-event', so you can't say 'enable-event *' and then 'disable-event > foo:*' to get all events except 'foo:*'. > > If you could constrain the application to use a particular trace provider > name for all of its tracepoints, say "app", then you could just do 'lttng > enable-event app:*'. If you can't do that, then I think you need to fall > back on getting a list of all the available tracepoints using 'lttng list > -u', parsing this to find all of the available tracepoints, extracting the > trace provider name from them, then using 'lttng enable-event <provider>:*' > for each provider other than the provider from your uninteresting library. I > think there are APIs that can be used instead of issuing the 'lttng' commands. > > I would certainly also like a way to be able to, say, enable all events other > than foo:* and bar:* using one command.
I submitted a patch that does exactly this a while ago: http://lists.lttng.org/pipermail/lttng-dev/2012-June/018179.html Although it's not upstream it works well for us. Thanks, Paul > > Regards, > David > >> -----Original Message----- >> From: Ikaheimonen, JP [mailto:[email protected]] >> Sent: Friday, 8 February 2013 7:56 PM >> To: [email protected] >> Subject: [lttng-dev] How to disable an event that's been enabled by a >> wildcard selection or -a? >> >> Consider the following scenario. >> I want to write a script that traces all UST tracepoints of a given >> application. I have no idea what the names of these tracepoints are. >> Also, I know that the application uses a library that contains some >> tracepoints I am not interested about. Now I want to trace all UST >> tracepoints except the ones I already know about. Is this possible with >> the lttng commands? >> >> If I enable all tracepoints with "lttng enable-event -u -a" I get all >> events, even those I do not want. I've tried using "lttng disable- >> event", and "lttng enable-event" with a filter, but I cannot seem to be >> able to get rid of the specific events. >> >> Thank you, >> >> JP Ikaheimonen >> Mentor Graphics Embedded Systems Division >> Nucleus(r) | Linux(r) | Android(tm) | Services | UI | Multi-OS >> >> Android is a trademark of Google Inc. Use of this trademark is subject >> to Google Permissions. >> Linux is the registered trademark of Linus Torvalds in the U.S. and >> other countries. >> >> _______________________________________________ >> lttng-dev mailing list >> [email protected] >> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > ---------------------------------------------------------------------- > The information contained in this transmission may be confidential. Any > disclosure, copying, or further distribution of confidential information is > not permitted unless such privilege is explicitly granted in writing by > Quantum. Quantum reserves the right to have electronic communications, > including email and attachments, sent across its networks filtered through > anti virus and spam software programs and retain such messages in order to > comply with applicable data security and retention requirements. Quantum is > not responsible for the proper and complete transmission of the substance of > this communication or for any delay in its receipt. > > _______________________________________________ > lttng-dev mailing list > [email protected] > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > -- Paul Woegerer | SW Development Engineer http://go.mentor.com/sourceryanalyzer Mentor Embedded(tm) | Prinz Eugen Straße 72/2/4, Vienna, 1040 Austria Nucleus® | Linux® | Android(tm) | Services | UI | Multi-OS Android is a trademark of Google Inc. Use of this trademark is subject to Google Permissions. Linux is the registered trademark of Linus Torvalds in the U.S. and other countries. _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
